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iStock (DALLAS) — The family of a Texas mother who went missing three weeks ago say they are clinging to hope of finding her alive. Erica Hernandez’s sister and two of her three children told ABC station KTRK-TV in Houston that Mother’s Day was one of the most agonizing and lonely days they’ve had to endure since she vanished in April. “Life goes on, but it really doesn’t for us,” Hernandez’s tearful 19-year-old daughter, Briza Armenta, said in the interview. “You know, our main focus is to just keep searching for her. To keep looking for clues and keep spreading …